Subject: Re: Kernel copyin/out optimizations for ARM...
To: None <Richard.Earnshaw@arm.com>
From: Ben Harris <firstname.lastname@example.org>
Date: 03/12/2002 12:00:12
On Tue, 12 Mar 2002, Richard Earnshaw wrote:
> > On Tue, Mar 12, 2002 at 10:38:39AM +0000, Richard Earnshaw wrote:
> > >
> > > I've always wondered why that code wasn't written using ldrt/strt for the
> > > user-space accesses. That would then use the hardware for permission
> > > checking and eliminate the most expensive part of that code (doing the tlb
> > > check manually).
> > not in ARM v3?
> Nope; even the ARM2 had these IIRC.
Indeed, and the arm26 copyin/out uses them.
Ben Harris <email@example.com>
Portmaster, NetBSD/arm26 <URL:http://www.netbsd.org/Ports/arm26/>